55785979 has 2 divisors, whose sum is σ = 55785980. Its totient is φ = 55785978.

The previous prime is 55785941. The next prime is 55785991. The reversal of 55785979 is 97958755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55785979 - 2¹⁹ = 55261691 is a prime.

It is a super-2 number, since 2×55785979² = 6224150905976882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55785479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27892989 + 27892990.

It is an arithmetic number, because the mean of its divisors is an integer number (27892990).

Almost surely, 2^55785979 is an apocalyptic number.

55785979 is a deficient number, since it is larger than the sum of its proper divisors (1).

55785979 is an equidigital number, since it uses as much as digits as its factorization.

55785979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969000, while the sum is 55.

The square root of 55785979 is about 7469.0012049805. The cubic root of 55785979 is about 382.0982245150.

The spelling of 55785979 in words is "fifty-five million, seven hundred eighty-five thousand, nine hundred seventy-nine".